I never use filters just a airstone to move water a little. Water changes and lots of plants work just fine....well at least if you keep a close eye on things and know how to keep them in line when needed.

FYI
Some plants do better in stagnant water IME.
Ex ricca,pellia,duckweeds,lillys,grasses,some hyrgos when emersed.
moss in 1 inch of water grows great in a sunny window